1980513971 has 2 divisors, whose sum is σ = 1980513972. Its totient is φ = 1980513970.

The previous prime is 1980513961. The next prime is 1980513989. The reversal of 1980513971 is 1793150891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1980513971 - 2¹⁸ = 1980251827 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1980513961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990256985 + 990256986.

It is an arithmetic number, because the mean of its divisors is an integer number (990256986).

Almost surely, 2^1980513971 is an apocalyptic number.

1980513971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980513971 is an equidigital number, since it uses as much as digits as its factorization.

1980513971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 44.

The square root of 1980513971 is about 44502.9658674565. The cubic root of 1980513971 is about 1255.8158789549.

The spelling of 1980513971 in words is "one billion, nine hundred eighty million, five hundred thirteen thousand, nine hundred seventy-one".